Bubbles Solutions of Laminated Glass with EVA Interlayer Film By Peter Lin
++What People May Think, When They Face Bubbles
When some customers processing laminated glass with EVA INTERLAYER FILM, bubbles appear inside the laminated glass, People would always think in these ways:
1-The EVA INTERLAYER FILM I ordered last time, didn’t have bubbles problem, why this time the bubbles is coming out, that’s definitely the reason of the quality of EVA INTERLAYER FILM.
2-Some customers face this situation. Maybe they don’t use EVA INTERLAYER FILM very much, so they don’t finish the one roll of EVA INTERLAYER FILM in a short period. They used two thirds of the roll of EVA INTERLAYER FILM, and after several weeks, they go back to use the left part of the roll. But this time the bubbles are coming out, they are very confused. How come the same roll of EVA INTERLAYER FILM has different quality?
3-Some customer may just change the new EVA INTERLAYER FILM supplier and the bubbles comes out. Even their new supplier tell them it’s all about the processing , they would not believe him, they would think it’s of course the problem of the quality of your EVA INTERLAYER FILM, because the EVA INTERLAYER FILM of my old supplier don’t have this bubbles problem.
++General Reasons for Bubbles
Many Laminated glass producers have misconception of the reasons of the bubbles problems. Here is the real why:
1-First situation: the temperature is too high, maybe more than 160 C degree, which will cause the EVA and other compound to break down and create gas. In this way, it’s just reducing your temperature, and everything would be fine.
2-Second situation: the temperature in the oven is not average, which means some part of the glass, is hotter than others. So some part of the EVA INTERLAYER FILM will melt and finish the cross-link reaction while other parts of EVA INTERLAYER FILM is still not melted, which will interrupt the vacuuming and cause the bubbles. For this situation, we suggest you modified the lamination machine.
3-Third situation: The oil of the vacuum pump needs to be renewed. The vacuum pump is old or the vacuum ability is not good enough. If the vacuum machine is old, renew it. If the vacuum ability is not powerful enough, try to buy a new one.
4-Four situation: the air moisture is high. The moisture in the air in your region is changed, which will easily cause the EVA INTERLAYER FILM wet when it exposes in the air. Moisture in the EVA INTERLAYER FILM would cause the bubbles. Although the EVA INTERLAYER FILM is less sensitive to moisture compared to PVB FILM. But if the moisture of EVA INTERLAYER FILM is too high, the bubbles will also come out.
Some customer open the packaged of one roll of EVA INTERLAYER FILM, and don’t use it up at one time. And the left part of the EVA INTERLAYER FILM will absorb the moisture in the air and cause the bubbles.
5-Five Situation: Different EVA INTERLAYER FILM supplier has different formula for EVA INTERLAYER FILM, so if you change the EVA INTERLAYER FILM supplier, you need to adjusting the processing parameters of time and temperature setting according to the supplier’s EVA INTERLAYER FILM property.
++Micro Reasons for Bubbles:
1-The plainness of the tempered glass is bad.
–As you known, tempered glass is less plain than the flat glass. So you should choose a company that produce better tempered glass.
